/*
 *
 * Copyright 2002 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 * 
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * 
 * - Redistribution in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
 * EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY
 * DAMAGES OR LIABILITIES SUFFERED BY LICENSEE AS A RESULT OF OR
 * RELATING TO USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE OR
 * ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE
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 * 
 * You acknowledge that this software is not designed, licensed or
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 * maintenance of any nuclear facility.
 * 
 */



package cart;

import java.util.*;
import database.BookDetails;
 
public class ShoppingCart {
  HashMap items = null;
  int numberOfItems = 0;

  public ShoppingCart() {
      items = new HashMap();
  }

  public synchronized void add(String bookId, BookDetails book) {
    if(items.containsKey(bookId)) {
        ShoppingCartItem scitem = (ShoppingCartItem) items.get(bookId);
        scitem.incrementQuantity();
    } else {
        ShoppingCartItem newItem = new ShoppingCartItem(book);
        items.put(bookId, newItem);
    }

    numberOfItems++;
  }

  public synchronized void remove(String bookId) {
    if(items.containsKey(bookId)) {
        ShoppingCartItem scitem = (ShoppingCartItem) items.get(bookId);
        scitem.decrementQuantity();

        if(scitem.getQuantity() <= 0)
            items.remove(bookId);

        numberOfItems--;
    }
  }

  public synchronized Collection getItems() {
      return items.values();
  }

  protected void finalize() throws Throwable {
      items.clear();
  }

  public synchronized int getNumberOfItems() {
      return numberOfItems;
  }
  public synchronized double getTotal() {
    double amount = 0.0;

    for(Iterator i = getItems().iterator(); i.hasNext(); ) {
        ShoppingCartItem item = (ShoppingCartItem) i.next();
        BookDetails bookDetails = (BookDetails) item.getItem();

        amount += item.getQuantity() * bookDetails.getPrice();
    }
    return roundOff(amount);
  }

  private double roundOff(double x) {
      long val = Math.round(x*100); // cents
      return val/100.0;
  }

  public synchronized void clear() {
      items.clear();
      numberOfItems = 0;
  }
}

